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Microstructure investigation of rapidly solidified Al–V–Fe alloys

Published online by Cambridge University Press:  31 January 2011

G. He*
Affiliation:
Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Hong Kong, People's Republic of China, and State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, 100083 Beijing, People's Republic of China
C. H. Shek
Affiliation:
Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Hong Kong, People's Republic of China
Joseph K. L. Lai
Affiliation:
Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Hong Kong, People's Republic of China
Z. Bian
Affiliation:
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, 100083 Beijing, People's Republic of China
X. D. Hui
Affiliation:
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, 100083 Beijing, People's Republic of China
G. L. Chen
Affiliation:
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, 100083 Beijing, People's Republic of China
*
a)Address all correspondence to this author.[email protected]
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Abstract

The microstructures and their thermal behaviors of quenched Al94V4Fe2, Al90V8Fe2, Al86V8Fe6, and Al85V9Fe2Ni4 alloys were investigated by x-ray diffraction, transmission electron microscopy, and differential scanning calorimetry. The as-quenched microstructures of the four alloys consist of quasicrystal particles and a fcc-α–Al matrix. The as-quenched Al86V8Fe6 and Al85V9Fe2Ni4 alloys also contain a small volume fraction of amorphous phase. All phases observed have fine morphologies with grain sizes of less than 100 nm. With the increase in V from 4 to 8 at.% at 2 at.% Fe, the average grain size decreases from 100 to 70 nm and the melting temperature of α–Al solid solution increases from 640 to 653 °C. The alloy with 8 at.% V has a finer and more stable microstructure than that of the alloy with 4 at.% V. The Fe addition has minor effect on grain size but improves the glass-forming ability. The Ni addition significantly improves the glass-forming ability and refines the microstructure. The metastable amorphous and quasicrystalline phases transform into a stable crystalline phase during continuous heating and cooling. The stable phases in these Al–V–Fe alloys include α–Al(V, Fe), Al10V, and Al80V12.5Fe7.5.

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Articles
Copyright
Copyright © Materials Research Society 2002

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